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DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.61. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically.

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Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 2, 1970 T875,002 SYNERGISTIC INSECTICIDAL COMPOSITIONS AND METHOD OF USE Ronald Eugene Montgomery, Middleport, and Harry Hobart Incho, Medina, N.Y., assignors to FMC Corporation, New York, N.Y., a corporation of Delaware Filed Nov. 15, 1968, Ser. No. 776,247 Int. Cl. A0111 9/02, 9/24, 9/36 US. Cl. 424-219 No Drawing. 12 Pages Specification Synergistic insecticidal combinations of esters of chrysanthemumic acid, for example pyrethrins, allethrin, and (1 cyclohexene 1,2 dicarboximido)methyl chrysanthemumate, with certain diw-alkynyl haloalkylphosphonate synergists, are described. These synergists have the general formula:

R 0 0-(CH2)n-CECH l T/ RCP C O-(CEz)mCEOH wherein X is halogen; R and R are each hydrogen, halogen, lower alkyl or halogenated lower alkyl; and n and m are each integers from one to four inclusive. The preparation of representative compounds of this class of di-walkynyl haloalkylphosphonates, for example di-3-butynyl chloromethylphosphonate, and the synergistic activity of said phosphonate with respresentative chrysanthemumate insecticides, are described in detail. 

